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Trouble Following Pier Example in Master Thesis

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Bill Sun

Trouble Following Pier Example in Master Thesis

Hi all,

I've been having trouble with the Pier Adaptive Forms example in the thesis titled "Magritte — Meta-Described Web Application Development".

In particular, I've typed all the necessary code in my browser, prefixing "PR" and "MA" where I think should be appropriate. I can add the Form, but the "Edit Form" command that I created will not work. I get the following output when clicking on the "Edit Form" link:

(In HTML format)

PREditFormCommand(Object)>>doesNotUnderstand: #label
self a PREditFormCommand
temps
aMessage label
inst vars
properties nil
context a PRContext stucture: 'Test Form' command: 'Edit Form'
answer nil
metamodel a MAContainer label: '' comment: nil
MASelectorAccessor>>read:
self (MASelectorAccessor read: #label write: #label:)
temps
aModel a PREditFormCommand
inst vars
properties nil
readSelector #label
writeSelector #label:

PREditFormCommand(Object)>>readUsing:

self a PREditFormCommand
temps
aDescription a MAStringDescription label: 'Label' comment: nil
inst vars
properties nil
context a PRContext stucture: 'Test Form' command: 'Edit Form'
answer nil
metamodel a MAContainer label: '' comment: nil

[] in MACheckedMemento(MAMemento)>>pullRaw {[:each | result at: each put: (self model readUsing: each)]}

self a MACheckedMemento model: a PREditFormCommand
temps
result a Dictionary(a MAStringDescription label: 'Kind' comment: nil->'Edit Form' )
each a MAStringDescription label: 'Label' comment: nil
inst vars
properties nil
model a PREditFormCommand
description a MAPriorityContainer label: 'Container' comment: nil
cache nil
original nil

(snipped)

Also, there seems to be a missing closing parenthesis on page 41 in the Form>>description method definition.

The Pier setup is obtained by installing the Pier Unix Security 1.0.3-alpha from SqueakMap Package Loader. In this version of Pier, clicking on the "Environment" command link will also crash Pier, is this expected?

Note: I am new to Smalltalk and Squeak.

Thanks,

-Bill

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Damien Cassou-3

Re: Trouble Following Pier Example in Master Thesis

Bill Sun wrote:
> Hi all,

Hello Bill,

> I've been having trouble with the Pier Adaptive Forms example in the
> thesis titled "Magritte — Meta-Described Web Application Development".
>
> In particular, I've typed all the necessary code in my browser,
> prefixing "PR" and "MA" where I think should be appropriate. I can add
> the Form, but the "Edit Form" command that I created will not work. I
> get the following output when clicking on the "Edit Form" link:
>
> (snipped)
>

Can you send us a file out of your code please ?

> Also, there seems to be a missing closing parenthesis on page 41 in the
> Form>>description method definition.

I agree:

Form>>description
^ (Container withAll: super description) ,
(self metamodel do: [ :each | each beEditable ])

> The Pier setup is obtained by installing the Pier Unix Security
> 1.0.3-alpha from SqueakMap Package Loader. In this version of Pier,
> clicking on the "Environment" command link will also crash Pier, is this
> expected?

You may want to try using the last version of Magritte and Pier from
Monticello. Do you know how to do this ?

> Note: I am new to Smalltalk and Squeak.

Welcome !

Bye

--
Damien

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Bill Sun

Re: Trouble Following Pier Example in Master Thesis

Hi Damien,

Thanks for your response! Here's the file-out.

I'll try out the latest version of Magritte and Pier from
Monticello later today.

-Bill

----- Original Message ----
From: Damien Cassou <[hidden email]>
To: Bill Sun <[hidden email]>; "SmallWiki, Magritte, Pier and Related Tools ..." <[hidden email]>
Sent: Friday, July 21, 2006 11:46:13 PM
Subject: Re: Trouble Following Pier Example in Master Thesis

Bill Sun wrote:
> Hi all,

Hello Bill,

Can you send us a file out of your code please ?

> Also, there seems to be a missing closing parenthesis on page 41 in the
> Form>>description method definition.

I agree:

Form>>description
   ^ (Container withAll: super description) ,
     (self metamodel do: [ :each | each beEditable ])

> The Pier setup is obtained by installing the Pier Unix Security
> 1.0.3-alpha from SqueakMap Package Loader.  In this version of Pier,
> clicking on the "Environment" command link will also crash Pier, is this
> expected?

You may want to try using the last version of Magritte and Pier from
Monticello. Do you know how to do this ?

> Note: I am new to Smalltalk and Squeak.

Welcome !

Bye

--
Damien

Pier-Forms.st (4K) Download Attachment

Bill Sun

Re: Trouble Following Pier Example in Master Thesis

In reply to this post by Bill Sun

Damien,

Ah, I see, the example from the thesis was integrated into the latest Pier. That's probably why you already have it.

The main difference that I see from the newest Pier and the code that I entered manually is that the PREditFormCommand class has both readUsing: and write:using: methods in the latest Pier while the code that I entered from the master thesis did not.

-Bill

----- Original Message ----
From: Damien Cassou <[hidden email]>
To: Bill Sun <[hidden email]>
Sent: Tuesday, July 25, 2006 12:28:25 AM
Subject: Re: Trouble Following Pier Example in Master Thesis

Bill Sun wrote:
> Hi Damien,

Hi Bill,

> Thanks for your response! Here's the file-out.
>
> I'll try out the latest version of Magritte and Pier from
> Monticello later today.

Your class is already present in my image so you may find your answer
into the last Magritte and Pier versions on monticello (repository:
http://mc.lukas-renggli.ch/magritte or /pier)

If this is still not clear, ask here.

Bill Sun

Re: Trouble Following Pier Example in Master Thesis

In reply to this post by Bill Sun

Yes the PRForms work perfectly in the newest Pier. The main cause was indeed the missing readUsing: and write:using: methods.

Here's my attempt at understanding what went wrong:
In my case, the missing readUsing: method caused the readUsing: method in Object to respond instead, which read the description of a PREditFormCommand instance rather than the description from the metamodel of the PRForm instance, which was missing a bunch of descriptions.

I'm not quite sure how does Pier knows what descriptions it needs to look for when I fed it the wrong descriptions. Can anyone shed some light?

Thanks,

-Bill

----- Original Message ----
From: Damien Cassou <[hidden email]>
To: Bill Sun <[hidden email]>
Sent: Tuesday, July 25, 2006 11:02:46 AM
Subject: Re: Trouble Following Pier Example in Master Thesis

Bill Sun wrote:
> Damien,
>
> Ah, I see, the example from the thesis was integrated into the latest
> Pier. That's probably why you already have it.
>
> The main difference that I see from the newest Pier and the code that I
> entered manually is that the PREditFormCommand class has both readUsing:
> and write:using: methods in the latest Pier while the code that I
> entered from the master thesis did not.

Does it work on the new version ? Do you understand why it doesn't on
the old one ? More questions ?

Bye

Lukas Renggli-2

Re: Trouble Following Pier Example in Master Thesis

> Yes the PRForms work perfectly in the newest Pier. The main cause
> was indeed the missing readUsing: and write:using: methods.

You can find my code in the official Pier repository http://mc.lukas-
renggli.ch/pier/. It is the package called Pier-Forms.

Lukas

--
Lukas Renggli
http://www.lukas-renggli.ch

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